you light up my life!
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You Light up my Life!. Lab Activity. ChemCatalyst. If you were to drop a spoonful of salt, NaCl, into a glass of water, what would happen? If you were to drop a gold ring into a glass of water, what would happen? - PowerPoint PPT PresentationTRANSCRIPT
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You Light up my Life!
Lab Activity
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ChemCatalyst If you were to drop a spoonful of salt, NaCl, into a glass of water, what would happen? If you were to drop a gold ring into a glass of water, what would happen? What do you think is different about the atoms of these two substances? Why wouldn’t the individual gold atoms come apart?
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The Big QuestionWhat patterns do we see in the properties of substances?
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At the end of this lab…
You will be able to: Predict whether MgSO4(aq),
epsom salts, will conduct electricity.
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Lab Set-up
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ActivityPurpose: This lesson allows you to collect evidence regarding some of the properties of substances, and look for patterns.
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Predictions Test Results
Substances Conduct?
Yes/No
Dissolve?
Yes/No
Conduct?
Yes/No
Dissolve?
Yes/No
H2O(l), water
Al(s), foil aluminum
C12H22O11(s), sucrose (sugar)
NaCl(s), salt,
sodium chloride
SiO2(s), sand,
silicon dioxide
C20H42(s), paraffin (wax)
C2H6O(l), ethanol
Cu(s), copper
CaCl2(s),
calcium chloride
CuSO4(s), copper sulfate
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
N/A
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(cont.)
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1. Substances that don’t Dissolve in water, BUT conduct electricity
• Copper• Aluminum foil
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2. Substances that dissolve in water
Conduct Don’t conduct
Salt-NaClCalcium-ChlorideCaCl2
Copper Sulfate-CuSO4
They are all IONIC BONDS
Sugar-C12H22O11
Ethanol-C2H6OWater-H2O
They are all COVALENT BONDS!
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NaCl – salt
CaCl2 – calcium chloride
CuSO4 – copper
sulfate
H2O – water
C12H22O11 – sugar
C2H6O – ethanol
Au – gold
Cu – copper
Al – aluminum
SiO2 – sand
C20H42 – paraffin
Dissolves
Yes No
Conducts
Yes Yes NoNo
Conducts
Wrap up
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3. What do the substances that conduct electricity once dissolved
have in common?They are all made up of ionic bonds. Ionic bonds are made up of a metal and a non-metal. Metals a good conductors of heat and electricity.
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4. What do the substances that Don’t conduct electricity once dissolved
have in common?They are all made up of covalent bonds. Covalent bonds are made up of all non-metals. Non-Metals a NOT good conductors of heat and electricity.
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5. & 6. Write a generalizing statement about the substances that DO and Don’t
light up the bulb.
Hint: • Think about bonds• What the bonds are made up of • Any properties
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7. Predict whether isopropanol, C3H8O (l), will
conduct electricity. No because it is all made up of covalent bonds and covalent bonds are made up of all non-metals. Non-Metals a NOT good conductors of heat and electricity.
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Making SenseIf it is dangerous to take a bath with a blow dryer, what must also be true about the water in the bathtub?
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Check-InPredict whether MgSO4(aq), epsom salts, will conduct electricity. State your reasoning.
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Question?The element K is located between Na and Rb. Based on where it is located on the periodic table, what are some properties that we can predict about K?